Hello again!
Problem is solved. I suspect it was a problem with the way I was instantiating
the baseWriter.
The version shown below is the one that works and differs in that I no longer
use the default constructor to instantiate the basewriter pointer. Could that
have been the cause of the problem?
Anyway, I now have blended png's and am very happy :)
Thanks again for a great library!
Cheers
Rich
++++++++++++++++++++++++++++++++++
...
// read the base file
string baseFilename = destinationDir + "/" + base + ".png";
pngwriter* baseWriter;
ifstream baseFile(baseFilename.c_str());
if (baseFile) {
baseWriter = new pngwriter(1,1,0,(destinationDir +
"/.tmp.png").c_str());
baseWriter->readfromfile(baseFilename.c_str());
} else {
baseWriter = new pngwriter(w, h, 0, baseFilename.c_str());
string desc = "Target: " +
base.substr(base.find_last_of("/")+1);
baseWriter->settext("GGG Cumulative Topology", "Richard
Andrews",
desc.c_str(), "BeGA");
}
baseFile.close();
...
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